When you are going to smoke, insuring the Windows stay opening, or has a good ventilation for the room.

当你要吸烟的时候，确保窗户是打开的，或者房间的通风状态良好。

youdao

When you are going to smoke, insuring the Windows stay opening, or has a good ventilation for the room.

当你要吸烟的时候，确保窗户是打开的，或者房间的通风状态良好。

youdao